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1.1 root 1: /*-
2: * Copyright (c) 1991 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
1.1.1.3 ! root 33: * from: @(#)tp_seq.h 7.5 (Berkeley) 5/6/91
! 34: * tp_seq.h,v 1.3 1993/05/20 05:27:52 cgd Exp
1.1 root 35: */
36:
1.1.1.3 ! root 37: #ifndef _NETISO_TP_SEQ_H_
! 38: #define _NETISO_TP_SEQ_H_
! 39:
1.1 root 40: /***********************************************************
41: Copyright IBM Corporation 1987
42:
43: All Rights Reserved
44:
45: Permission to use, copy, modify, and distribute this software and its
46: documentation for any purpose and without fee is hereby granted,
47: provided that the above copyright notice appear in all copies and that
48: both that copyright notice and this permission notice appear in
49: supporting documentation, and that the name of IBM not be
50: used in advertising or publicity pertaining to distribution of the
51: software without specific, written prior permission.
52:
53: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
54: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
55: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
56: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
57: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
58: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
59: SOFTWARE.
60:
61: ******************************************************************/
62:
63: /*
64: * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
65: */
66: /*
67: * ARGO TP
68: *
69: * These macros perform sequence number arithmetic modulo (2**7 or 2**31).
70: * The relevant fields in the tpcb are:
71: * tp_seqmask : the mask of bits that define the sequence space.
72: * tp_seqbit : 1 + tp_seqmask
73: * tp_seqhalf : tp_seqbit / 2 or half the sequence space (rounded up)
74: * Not exactly fast, but at least it's maintainable.
75: */
76:
77: #define SEQ(tpcb,x) \
78: ((x) & (tpcb)->tp_seqmask)
79:
80: #define SEQ_GT(tpcb, seq, operand ) \
81: ( ((int)((seq)-(operand)) > 0)\
82: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
83: : !(-((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
84:
85: #define SEQ_GEQ(tpcb, seq, operand ) \
86: ( ((int)((seq)-(operand)) >= 0)\
87: ? ((int)((seq)-(operand)) < (int)(tpcb)->tp_seqhalf)\
88: : !((-((int)(seq)-(operand))) < (int)(tpcb)->tp_seqhalf))
89:
90: #define SEQ_LEQ(tpcb, seq, operand ) \
91: ( ((int)((seq)-(operand)) <= 0)\
92: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
93: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
94:
95: #define SEQ_LT(tpcb, seq, operand ) \
96: ( ((int)((seq)-(operand)) < 0)\
97: ? ((-(int)((seq)-(operand))) < (int)(tpcb)->tp_seqhalf)\
98: : !(((int)(seq)-(operand)) < (int)(tpcb)->tp_seqhalf))
99:
100: #define SEQ_MIN(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? b : a)
101:
102: #define SEQ_MAX(tpcb, a, b) ( SEQ_GT(tpcb, a, b) ? a : b)
103:
104: #define SEQ_INC(tpcb, Seq) ((++Seq), ((Seq) &= (tpcb)->tp_seqmask))
105:
106: #define SEQ_DEC(tpcb, Seq)\
107: ((Seq) = (((Seq)+(unsigned)((int)(tpcb)->tp_seqbit - 1))&(tpcb)->tp_seqmask))
108:
109: /* (amt) had better be less than the seq bit ! */
110:
111: #define SEQ_SUB(tpcb, Seq, amt)\
112: (((Seq) + (unsigned)((int)(tpcb)->tp_seqbit - amt)) & (tpcb)->tp_seqmask)
113: #define SEQ_ADD(tpcb, Seq, amt) (((Seq) + (unsigned)amt) & (tpcb)->tp_seqmask)
114:
115:
116: #define IN_RWINDOW(tpcb, seq, lwe, uwe)\
117: ( SEQ_GEQ(tpcb, seq, lwe) && SEQ_LT(tpcb, seq, uwe) )
118:
119: #define IN_SWINDOW(tpcb, seq, lwe, uwe)\
120: ( SEQ_GT(tpcb, seq, lwe) && SEQ_LEQ(tpcb, seq, uwe) )
121:
1.1.1.3 ! root 122: #endif /* !_NETISO_TP_SEQ_H_ */
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